linux-kernel - [Patch 0/3] Speed up link_mem

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Message-Id: <20100929190053.992911934@gulag1.americas.sgi.com>
Date:	Wed, 29 Sep 2010 14:00:53 -0500
From:	Robin Holt <holt@....com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Dave Hansen <haveblue@...ibm.com>,
	Gary Hade <garyhade@...ibm.com>, Ingo Molnar <mingo@...e.hu>,
	Matt Tolentino <matthew.e.tolentino@...el.com>,
	"Robert P. J. Day" <rpjday@...shcourse.ca>
Subject: [Patch 0/3] Speed up link_mem_sections during boot.

During boot of a large system, we see a delay in the portion of boot which
is calling link_mem_sections().  On a 16TB x86_64 system, it is taking
1 hour 27 minutes.  With this patch set applied, it takes 46 seconds.

The speedup is accomplished by simply caching the results from the
previous find_memory_block and using that as a quick check to see if
the next block happens to be adjacent to the previous.  In our testing,
that was true 100% of the time.

---

 drivers/base/memory.c   |   28 ++++++++++++++++++----------
 drivers/base/node.c     |    8 +++++---
 include/linux/kobject.h |    2 ++
 include/linux/memory.h  |    2 ++
 lib/kobject.c           |   39 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 66 insertions(+), 13 deletions(-)
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